-moving developments after the stunning resigning of david petraeus. petraeus' cia confirmation hearings, his wife holly, and a few seats away to the right, the other woman at the center of all of this, paula broadwell. abc's martha raddatz with more on a third woman who alerted authorities, the red flag that set this into motion. >> reporter: dave petraeus' secret affair may never have been discovered if not for the threatening e-mails his lover sent to jill kelly, wife of a tampa surgeon, a long supporter of the military. officials say she was not romantically involved with petraeus, but was a family friend of petraeus and his wife. officials say the anonymous e-mails to kelly were so disturbing and obsessive, she called the authorities. they traced them to paula broadwell's computer. where, eventually, evidence of an affair between the cia director and broadwell was discovered. petraeus' is claiming the affair with broadwell did not begin until after he retired from the military in august 2011. it was a week later he became cia director. friends say the affair ended four months ago, about the t
